what used to work doesn't anymore?

usually when my husband and i have sex he does his thing and i rub to orgasm.. thats what we have done for 6 years... well all of a sudden that doesn't work. to the point i get annoyed and give up and sex just sucks. doesnt matter what we do or how turned on i am its just to hard to "get there" and its causing issues because id just rather not even have sex if its that much work and irritating.. so now what? ive tried everything. what do i do now?